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  • General Motors 9T50 Nine Speed FWD: Part One
    Thursday, August 1, 2019 12:00 AM
    Back in early Y2K General Motors and Ford demonstrated some impressive common sense by jointly developing a brand-new six-speed automatic transmission. The 6T70 / 6F50 and 6T40 / 6F35 transmission families have undergone countless changes since 2007 and are used in a variety of different models of vehicles currently.
  • Ford 6R140 - Valve Body Identification Guide
    Thursday, August 1, 2019 12:00 AM

    The Ford 6R140 valve bodies can be difficult to distinguish between the early- middle- and late-styles if you don’t know what to look for. Spotting the differences in the cast-ing numbers, separator plates and the cooler bypass valve is critical to proper identification.

  • Mercedes 7G-DCT Transmission (Part 2)
    Thursday, August 1, 2019 12:00 AM

    Last month’s article spoke about the susceptibility vehicles have with this transmission to bottom out and break the case. Having one of these on our bench here at ATSG (Figure 1), we will take advantage to look inside this transmission to see what it looks like.

  • R&R Tech: Expect the Unexpected
    Thursday, August 1, 2019 12:00 AM

    Here in the Midwest the dog days of summer are here, creating a hot, humid environment and the intermittent issues that seem to come with it. You know…the types of concerns in which you have to drive the vehicle for an extended road test, and by the time you see what the issue is and get back to the shop, the heat from the engine compartment or under the vehicle is almost unbearable and you can’t touch anything without heat resistant gloves on. Good times.

  • Who Says that Torque Converters are Non-Rebuildable?
    Monday, July 1, 2019 12:00 AM
    Who says that torque converters are non-rebuildable? Well, the OEMs have been saying it since the first sealed torque converter rolled off the assembly line, and they continue to say it today. “But,” you say, “I think the torque converter aftermarket gets good support from the OEs, don’t they?" Well, see what happens when you go the dealership parts-counter and ask for some torque converter parts... 
  • R & R Tech: Picking Up Bad Vibrations
    Monday, July 1, 2019 12:00 AM

    Quite a lot has been written and many technical classes have been put on regarding the General Motors 8L45/8L90 family of transmissions. We are now seeing opportunities to put that information to use. The vehicles equipped with these transmissions are beginning to trickle into our shops as they are beginning to fall out of factory warranty. Many GM vehicles utilize these transmissions from 2015 to present.

  • Souza Sezz: U880E/AF50-8 Electronic Information
    Monday, July 1, 2019 12:00 AM
    Mike Souza provides electronic information on the U880E/AF50-8 transmission.
  • Mercedes’s 7G-DCT Transmission (part 1)
    Monday, July 1, 2019 12:00 AM

    Several years ago, Jan ten Klooster, an excellent tech in Amsterdam sent me pictures of the 7G-DCT transmission that came out of a 2013 Mercedes CL A 200 1.6L vehicle (Figure 1). This dual clutch transmission came out in 2011 in both the A and B class vehicles. The reason such a new vehicle came in to Jan’s shop for repairs is the owner had inadvertently bottomed out the car breaking the transmission’s case.

  • TASC Force Tips: Converter Clutch Control Part 2
    Friday, May 31, 2019 12:00 AM
    Bob Warnke follows up his discussion of converter clutch control from the April issue.
  • No Forward Good Reverse - A Leave Out or a Blow Out
    Friday, May 31, 2019 12:00 AM
    Wayne Colonna discusses the UNIGEAR output shaft assembly.
Beyond the missions of providing education and reference materials, Transmission Digest serves as a prime resource used as shops find the parts, supplies and services necessary for successful and profitable operation. Nine of the 12 issues published each year are focused on the products, services and suppliers relating to a specific profit center within the retail shop.

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